System of electrical regulation.



W. A. TURBAYNE.

SYSTEM OF ELECTRICAL REGULA'HON.

APPLICATION FILED senza, 1912. RENEWED SEPT. 13. 1918.

Patented Apr. 22, 1919.

HlllHllllIlHll 1720671237 W wwb dim Q STATES PATENT OFFI E.

I WILLIAM A. 'rUnnAY'NE, or NIAGARA FALLS, NEW YORK, ASSIGNOR, BY MESNEASSIGNMENTS, TO U. S. LIGHT & HEAT CORPORATION, or NIAGARA FALLS, NEWYORK, A coRronA'rIoN or: NEW ronx.

Application. filed September 26, 1912, Serial No. 722,502. RenewedSeptember 13, 1918. Serial No. 253,984.

To all whom it may concern:

Be it known that 1, WILLIAM A. TUR- BAYNE, a citizen of the UnitedStates, residing at Niagara Falls, in the county of Niagara and State ofNew York, have invented new and useful Improvements 1n Systems ofElectrical Regulation, of which the following is a full, clear, concise,and exact description, reference being had to the accompanyingdrawing,-forming a part of this specification.

This inventio relates to improvements in systems of electricalregulation.

This regulator is adapted for in car lighting, and more especially insystems installed on cars in which the load is aptto be excessive attimes. In some systems. such as thOSe in use on private cars which oftenstand several days in the station, it is desirable to employ anequipment of greater than the ordinary capacity, and this is oftenaccomplished by employing two sets of bat-- teries and generatorsconnected in parallel to insure proper charging thereof.

An object of this invention is to provide a regulating system in whichthe generators may supplyi. sufiicient current to properly charge thebatteries and supply the lamps at all times, and also which may besubject to proper regulation to prevent injuries to the batteries fromovercharge, or to the lamps in case the batteries are open, circuited. 3

Another object of the invent' lQi is to .pro-, vide a regulator for asystem in which'a second generator may be connected in parallel with themain generator under conditions of heavy load to prevent overload on themain generator.

The drawing illustrates diagrammatically one form which this inventionmay assume.

Two generators A and B are arranged in parallel.

The generator A is similar to that disclosed in a co-pendingapplication, Serial No. 722.276, filed September 25, 191-2, and.comprises an armature 1 and a shunt field 2, In series with the field 2is a variable resistance 3, here shown as a compressible rheo- 4Specification of Letters Patent.

SYSTEM OI ELECTRICAL REGULATION.

Patented Apr. 22, 1919.

ranged acrOss the system. The plungen9 carries a movable contact 11which cooperates with the fixed contact 12 and controls the shortcircuit around the resistance 7. The resistance 8 is'bodily movable bythe plunger 9 to complete its circuit at the fixed contact 13. Anautomatic switch 14 of any preferred type controls the circuit fromgenerator 1, and cuts in or out according to the voltage of thegenerator.

The generator B comprises an armature 15 and a shunt field 16 regulatedby means of a-variable resistance in series therewith, as by thecompressible rheostat 17, controlled through the bell crank lever 18 bya coil 19 in series with the generator B. An automatic switch 20 isoperated by a single coil 21 in series with generator A, and willoperate upon sufiicient increase in load to connect generatorB throughcontacts 22 to the line, and to complete the circuit for field winding16 through contacts 22 and through the parallel path pro'vided'bycontacts 23, 24. and conductor 25. The contacts 23 and 21 are preferablyarranged to close slightly before the contacts 22. By thus energizingthe field 16 before closing the circuit to the armature 15, the initialrush of current through the armature as the switch closes is minimized.Batteries 26 and lamps or other translating devices 27 are connected inmultiple across the main conductors 28, 29. A suitable switch 8 and aregulator diagrammatically illustrated at 30 may control the lampcircuit, if desired.

Starting with the generators at rest, any lamp load will be supplied bythe batteries in the usual'manncr. The automatic switches will be openedand coils l and 19 consequently dcnergized, thereby reducing ing.

the resistance of rheostats 8 and 17 to a Il'lllllllllllll. Theresistance 7 will be short circuited and the circuit of rheostat 8broken at contact 13. As the generators begin to operate, generatorA,whose field is connected in, will pick up and when the generatorvoltage is sufiiciently high automatic switch 1% will close, connectinggenerator A to the battery and lamps. Coil 4: will operate throughresistance 3 to control the output of this generator and tend to causethe same to provide a constant current, regardless of the back E. M. F.of the battery, conditions of load or generator speed. Upon apredetermined condition being reached, which represents substantiallythe voltage above which it is not desirable to charge the batteries,coil 10 will become sufficiently energized to open the short circuitaround resistance 7, thus placing it in series with the field windingand at the same time will close a parallel circuit around the field fromconductor :28 through conductors 31 and 32, contact 13, rheostat 8 andconductor 33, to the point 31, where it joins the field circuit throughresistance 7, conductor 35 and rheostat 3 to conductor '29. The effectof resistance 7 and the circuit in parallel to the field winding issufficient to reduce the battery charging current substantially to zeroand to cause the battery to float across the line. to again return toits minimum value, and from this point generator A is regulated forconstant potential by means of coil 10, which decreases the resistanceofrheostat S as the speed of the generator rises, thus diverting morecurrent from the field wind- Should the batteries become depleted, orfrom any other cause should the load be heavy, current in the coil 21will be sufficient to closeswitch 20, thus connecting generator B inparallel with generator A and closing the field circuit 16. ThegeneratorB would then supply itsproportion of the load, and would beproperly regulated for constant current through the action of the seriescoil 19 and the resistance 17. It Will thus be seen that whenever thebattery and lamps provide a load sufiicientto overload generator A, ifacting alone, the switch 20 will 0 erate, cutting in generator B andthereafter permitting the two generators to operate in parallel tosupply constant current. Upon full charge of the battery, however, underordinary conditions, generator B would be cut out, due to the decreasein current output from generator A. If, however, at this time thelampload is sufliciently heavy, generator B may still continue to operate,supplying current. up to the limit set by its regulator, and thegenerator A supplying the remainder of the load. There is thus provideda system in which the gener- This permits resistance 3 ators may beoperated in parallel and still maintain the characterlstics of thecombined current and voltage regulation, which has in some instancesbeen found desirable.

lVhat I claim as new and desire .to secure by Letters Patent of theUnited States is:

1. In a car lighting system, the combination of two independentgenerators connected in parallel, storage batteries charged thereby, andmeans limiting the output of the generators to cause the batteries tofloat at full charge.

2. In combination, a generator, a storage battery to be charged thereby,a second generator adapted to be connected in parallel to said firstgenerator under predetermined conditions, and means responsive to thebattery voltage for decreasing the output of the first generator andcausing disconnection of the second generatorwhen said battery voltagehas risen a predetermined amount.

3. In a car lighting system, a generator, regulating means thereforadapted under predetermined conditions to maintain the generator atconstant potentiahand a second generator adapted to be connected inparallel, and regulating means therefor opcrating. to cause itsgenerator to deliver a constant current.

4. In a car lighting system, a generator, combined current and voltageoperated regulating means therefor, a second generator, and meansdepending on the load on the first generator for connecting the secondgenerator in parallel to the first.

5. In a car lighting system, a generator, regulating means therefor,said means operating under predetermined conditions to maintain saidgenerator at constant potential, a second generator, and meanscontrolled by the current output of the first generator to connect thesecond generator in parallel therewith,

6. In a car lighting system, a generator, a load circuit, a secondgenerator, said generator having a vshunt field winding and meansdepending upon the current output of the first generator for completingthe cirthe current output of the first generator for connecting thesecond generator in parallel to the first.

9. In a car lighting system, two independ- In witness whereof, I havehereunto subent variable speed generators connected in scribed my name1n the presence of two parallel, and lndependent regulating meanswltnesses.

for said generators, one of said regulating W'ILLIAM A. TURBAYNE. 5means causing, its generators to deliver con- Witnesses:

stunt voltage under predetermined con- T. J. CALLAHAN,

dit-ions. F. G. SWANNIE.

